Biomedical subjects

Yi-Chu Liao

Publications and source records attributed to Yi-Chu Liao.

6 recordsLinked to original sources

PubMed2005

Family members favor disclosing the diagnosis of Alzheimer's disease.

BACKGROUND: Past negative attitudes towards patients with Alzheimer's disease (AD) have changed in recent years. However, the disclosure of AD diagnosis to patients and family remains an unresolved issue. In this study, we surveyed the family members of neurological patients in Taiwan for the purpose of assessing their attitudes towards the disclosure of AD diagnosis. METHODS: The study sample consisted of family members (150, age range 23-89 years, mean 55.0+/-14.3) who accompanied patients to a neurology outpatient clinic from September 15 to November 24, 2003. The subjects were given an Attitude Questionnaire on AD Disclosure. RESULTS: An overwhelming majority (93%) of subjects favored disclosure of the diagnosis if, hypothetically, they personally were affected by AD. However, a smaller majority of family members (76%) favored disclosure of the diagnosis to current AD patients. Reasons for favoring disclosure included a patient's or family member's right to know, the possibility of assistance in coping with and understanding dementia, and slowing down the progression of the disease by early treatment, as well as the increased probability of accepting treatment and life activity training. Reasons for favoring the withholding of disclosure included the risk of causing the patient emotional disturbance, worsening the disease, the irrelevance of disclosure to drug therapy, and the possibility of causing suicidal ideation. Subjects' attitudes towards disclosure of AD diagnosis were unaffected by their knowledge of dementia, the presence of a family member with AD, their role as the primary caregiver, the length of time that AD symptoms persisted, and the number of hours per day spent in caring for AD patients. CONCLUSIONS: In Taiwan, family members of neurological patients strongly favor being informed and the disclosure of AD diagnosis to the family.

Adult↗

PubMed2005

Cognitive reserve: a SPECT study of 132 Alzheimer's disease patients with an education range of 0-19 years.

This study examines the associations between education, cerebral perfusion, and cognitive test performance among 132 patients with Alzheimer's disease. The participants had had between 0 and 19 years of formal schooling, and had either mild or moderate dementia according to the Clinical Dementia Rating Scale. Cerebral perfusion was evaluated by the (99m)Tc-hexamethylpropylene amine oxime single photon emission computed tomography. The Mini-Mental State Examination and the Cognitive Abilities Screening Instrument were used to assess cognitive performance. For patients at each clinical dementia severity level, statistical parametric mapping was used to examine voxel by voxel the association between education and cerebral perfusion, and Pearson's correlation coefficients were calculated between education and cognitive test scores. Years of formal schooling had negative associations with cerebral perfusion and positive associations with cognitive test scores. The brain regions showing a significant education effect on perfusion involved bilateral posterior association areas in mild dementia, and bilateral parieto-temporo-frontal areas in moderate dementia. The present findings indicate that the cognitive reserve effect starts at the low end of the education range. They also suggest that the main effect of more education is a more facile use of alternative brain circuits instead of locally increased synaptic connections.

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PubMed2004

Longitudinal cerebral perfusion decrease in mild alzheimer's disease revealed by SPECT with statistical parametric mapping method.

Fifteen patients with mild Alzheimer's disease received baseline and follow-up technetium-99m hexamethylpropylene amine oxime SPECT examinations paired with neuropsychological assessments, including the Cognitive Ability Screening Instruments (CASI). The differences between baseline and follow-up SPECT images were analyzed by the voxel-based paired t test of the statistical parametric mapping technique. A simple regression analysis was also conducted to analyze the correlation between CASI sub-scores and both sets of SPECT images. In comparison with baseline images, cerebral perfusion at follow-up was significantly reduced in the left superior and middle temporal gyri, right middle and inferior temporal gyri, and right fusiform gyrus. A significant correlation was demonstrated between the list-generating fluency CASI sub-score and perfusion of the left fusiform gyrus. The visual construction sub-score was significantly correlated with perfusion of the right superior and medial frontal gyri.

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PubMed2003

Bathing headache: a variant of idiopathic thunderclap headache.

Bathing headache is rarely described in literature. We report four middle-aged Taiwanese women who developed severe throbbing headache with maximum intensity of onset during bathing. Diffuse cerebral vasospasm was demonstrated in one of them. All their headaches resolved spontaneously (n = 1) or after nimodipine treatment (n = 3). Except for one patient with vasospasm in whom reversible posterior leukoencephalopathy and an asymptomatic cerebellar infarction developed, the others recovered without any complications. The clinical profile of bathing headache points to idiopathic thunderclap headache. It may not be as benign as previously reported. Nimodipine might be effective in treatment of this special headache syndrome.

Adult↗

PubMed2003

Statistical parametric mapping of brain SPECT perfusion abnormalities in patients with Alzheimer's disease.

Brain perfusion in 20 patients with mild Alzheimer's disease (AD), 20 patients with moderate AD and 20 control subjects (matched for age, gender and education) were assessed by single photon emission computed tomography (SPECT) using technetium-99m hexamethylpropylene amine oxime ((99m)Tc-HMPAO). SPECT images were transformed to a standard size and shape for group comparisons by the voxel-based t test of the statistical parametric mapping techniques. Cerebral hypoperfusion in the left lower parietal area was found in mild AD patients. In moderate AD patients, significant cerebral hypoperfusion was located in bilateral posterior parietotemporal cortices, contiguous anterior occipital lobes, posterior cingulate gyri and, to a lesser extent, in frontal areas.

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PubMed2003

Selective hypoperfusion of anterior cingulate gyrus in depressed AD patients: a brain SPECT finding by statistical parametric mapping.

This study tests the hypothesis that depression in patients with Alzheimer's disease (AD) is due to a specific pathogenesis rather than a reactive phenomenon. Forty-three AD patients received a psychiatrist's interview, neuropsychological assessments, and a 99mTc-hexamethyl propyleneamine oxime single photon emission computed tomography (HMPAO-SPECT). Analysis by statistical parametric mapping (SPM) showed that the depressed group had selective hypoperfusion in the bilateral anterior and posterior cingulate gyri and precuneus. Using the Hamilton Depression Rating Scale as a parameter, an inverse correlation was found between cerebral perfusion and the severity of depression. The right anterior cingulate gyrus demonstrated a most significant reduction in perfusion. These locations are akin to the imaging findings in patients with primary depression, indicating a specific pathogenesis for depression in AD.

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